resign commission for warrant officer questions

I am a 1LT in the Army National Guard, an Aviator, and I would like to
go on active duty. I have done some research and my options are to
apply to the Active Guard and Reserve or enter as a warrant. I have
been surrounded by warrants and I like them and there responsibilities
are real important and it would be a great honor to be counted in
their ranks. I cannot find out if I have to go to WOC school or not.
I have been to Federal OCS at Benning and a Federal Law Enforcement
Academy. I am interested in finding out if I have to attend yet
another candidate school. I hear it both ways but no AR has been
pointed out that states the facts definitively. Thanks for your help.